The Influence of Metabolic Syndrome in Predicting Mortality Risk Among US Adults: Importance of Metabolic Syndrome Even in Adults With Normal Weight
Ting Shi, Binhuan Wang, S. Natarajan
Abstract
INTRODUCTION: Although metabolic syndrome (MetS) is less prevalent among normal-weight adults than among overweight and obese adults, it does occur. The objective of our study was to examine how mortality risks differed in weight categories stratified by presence/absence of MetS. METHODS: ]) and presence/absence of MetS. After conducting unadjusted analyses, we used Cox proportional hazards models to evaluate mortality risk as multivariable hazard ratios among obesity-MetS categories while controlling for selected covariates. RESULTS: The analysis included 12,047 adults. The prevalence of MetS was 61.6% in the obese group, 33.2% in the overweight group, and 8.6% in the normal-weight group. The multivariate adjusted hazard ratio (95% confidence interval) for mortality among the obesity-MetS groups, compared with the normal-weight-no-MetS group, were as follows: normal-weight-MetS (1.70 [1.16-2.51]), overweight-no-MetS (0.99 [0.77-1.28]), overweight-MetS (1.10 [0.85-1.42]), obese-no-MetS (1.08 [0.76-1.54]), and obese-MetS (1.30 [1.07-1.60]); differences were significant only for the normal-weight-MetS group and obese-MetS group. CONCLUSION: MetS is a risk factor for mortality among normal-weight and obese adults. In our study, normal-weight adults with MetS had the highest mortality among the 6 groups studied, suggesting that interventions should also focus on MetS patients with normal weight.